I need an Instapay-branded online payment gateway that lets my customers check out quickly from web or mobile browsers. The main priority is seamless mobile usability—every screen, API call, and redirect has to feel instant on a phone. Here’s what I’m after: • A fully documented REST or GraphQL API that merchants can drop into any website. • Responsive, PCI-compliant checkout pages branded with our Instapay colours and logo. • Tokenisation and strong encryption from card entry through settlement. • Real-time transaction dashboard showing authorisations, captures, refunds, and chargebacks. • Sandbox and production keys, plus step-by-step integration guide so other developers can go live in under an hour. At launch the gateway must accept mobile-friendly payment methods; I’m open to expanding into credit/debit cards, digital wallets or bank transfers once the core flow is stable, so build with extensibility in mind. If you’ve built similar gateways, especially those optimised for smartphones, that will help me move fast. Please outline your approach, timeline, and any third-party services you plan to leverage so I can assess fit quickly.